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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textuals) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Accounting Policies [Abstract] |  |  |  |  |
Common Stock Dividend Percentage Rate | 25.00% |  |  | 25.00% |
Stockholders' Equity Note, Stock Split |  |  |  | All applicable share and per share information has been adjusted retrospectively to give effect to the 5-for-4 stock split. |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Net income attributable to HEICO | $ 45,686 |  | $ 38,657 | $ 86,613 | $ 69,928
Weighted Average Number of Shares Outstanding, Diluted | 86,637 |  | 85,035 | 86,520 | 84,980
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 3,100 |  | $ 3,100 |
Net income attributable to HEICO |  | $ 2,600 |  |  |
Weighted Average Number of Shares Outstanding, Diluted | 747 |  |  | 712 |

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